Controlled prefetching of data requested by a peripheral
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United States of America Patent
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Jul 28, 1998
Issued Date -
N/A
app pub date -
Jun 5, 1997
filing date -
Jul 21, 1992
priority date (Note) -
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Abstract
A method and apparatus for determining when an Input/Output (I/O) module should prefetch cache lines of data from main memory. Following a request for data from a peripheral, connected to an I/O bus which supports a flexible protocol allowing peripherals with various capabilities to operate, the I/O module will request a cache line of data from main memory containing a beginning portion of the requested data. The I/O module may then prefetch consecutive cache lines containing requested data according to the operating parameters of the peripheral requesting the data and the requested data. The I/O module may prefetch in such way that neither system bus bandwidth nor I/O bus bandwidth is wasted.
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